參數資料
型號： HD4046212R
廠商： Hitachi,Ltd.
英文描述： AS Microcomputer Incorporating a DTMF Generator Circuit(微計算機帶雙音多頻發(fā)生器電路)
中文描述： 由于微機安裝有雙音多頻發(fā)電機斷路器（微計算機帶雙音多頻發(fā)生器電路）
文件頁數： 21/155頁
文件大?。?/td> 549K
代理商： HD4046212R
HD404629R Series
21
Item
Abbr.
Status After Cancel-
lation of Stop Mode by
STOPC
Input
Status After Cancel-
lation of Stop Mode by
RESET Input
Status After all Other Types
of Reset
Carry flag
(CA)
Pre-stop-mode values are not guaranteed;
Pre-MCU-reset values
Accumulator
(A)
values must be initialized by program
are not guaranteed; val-
B register
(B)
ues must be initialized by
W register
(W)
program
X/SPX register
(X/SPX)
Y/SPY register
(Y/SPY)
Serial data register
(SRL, SRU)
RAM
Pre-stop-mode values are retained
RAM enable flag
(RAME)
1
0
0
Port mode
register C bit 2
(PMRC2)
Pre-stop-mode
values are retained
0
0
System clock
select register bit 3
(SSR3)
Interrupts
The MCU has 11 interrupt sources: five external signals (
INT
0
,
INT
1
, INT
2
–INT
4
), four timer/ counters
(timers A, B, C, and D), serial interface, and A/D converter.
An interrupt request flag (IF), interrupt mask (IM), and vector address are provided for each interrupt
source, and an interrupt enable flag (IE) controls the entire interrupt process.
Some vector addresses are shared by two different interrupts. They are timer B and INT
2
, timer C and
INT
3
, timer D and INT
4
, and A/D converter and serial interface interrupts. So the type of request that has
occurred must be checked at the beginning of interrupt processing.
Interrupt Control Bits and Interrupt Processing:
Locations $000 to $003 and $022 to $023 in RAM are
reserved for the interrupt control bits which can be accessed by RAM bit manipulation instructions.
The interrupt request flag (IF) cannot be set by software. MCU reset initializes the interrupt enable flag
(IE) and the IF to 0 and the interrupt mask (IM) to 1.
A block diagram of the interrupt control circuit is shown in figure 9, interrupt priorities and vector
addresses are listed in table 2, and interrupt processing conditions for the 11 interrupt sources are listed in
table 3.
An interrupt request occurs when the IF is set to 1 and the IM is set to 0. If the IE is 1 at that point, the
interrupt is processed. A priority programmable logic array (PLA) generates the vector address assigned to
that interrupt source.
The interrupt processing sequence is shown in figure 10 and an interrupt processing flowchart is shown in
figure 11. After an interrupt is acknowledged, the previous instruction is completed in the first cycle. The
IE is reset in the second cycle, the carry, status, and program counter values are pushed onto the stack
相關PDF資料
PDF描述
HD404628R AS Microcomputer Incorporating a DTMF Generator Circuit(微計算機帶雙音多頻發(fā)生器電路)
HD4074629 AS Microcomputer Incorporating a DTMF Generator Circuit(微計算機帶雙音多頻發(fā)生器電路)
HD404629R AS Microcomputer Incorporating a DTMF Generator Circuit(微計算機帶雙音多頻發(fā)生器電路)
HD404638R 4-Bit Single-Chip Microcomputer(4位單片微計算機)
HD40A4638R 4-Bit Single-Chip Microcomputer(4位單片微計算機)
相關代理商/技術參數
參數描述
HD4046212RFS 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller
HD4046212RH 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:AS Microcomputer Incorporating a DTMF Generator Circuit
HD4046212RTF 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller
HD4046212TF 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller
HD404628FS 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller
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